home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!portal!cup.portal.com!Ted_Eugene_Viens
- From: Ted_Eugene_Viens@cup.portal.com
- Newsgroups: sci.electronics
- Subject: Re: RF leakage from TV cable system
- Message-ID: <69286@cup.portal.com>
- Date: Tue, 10 Nov 92 21:38:40 PST
- Organization: The Portal System (TM)
- References: <1992Nov7.213033.163@gems.vcu.edu>
- <1992Nov9.034219.29018@athena.cs.uga.edu>
- <1992Nov9.143426.28306@erenj.com>
- Lines: 30
-
- >|>
- >
- >I live next to a Hospital, and am frequently getting interference (I think
- >from the hospital- ambulances, etc) on Cable channel 21. The best part
- >is, Channel 21 is the weather channel, and the interference only comes at
- >the time when my local forecast is telling me something useful. As soon
- >as the transmission stops, I can see which cold front from Manitoba is
- >going through North Dakota.
- >
- >Could leakage in my own house be letting that interference in? If not, I
- >guess I oughta call the cable company and demand they fix it somewhere, but
- >then I'd cause a lot of people with splitters, descramblers, etc to get caught
- ,
- >huh?
- >--
- >----------------------------------------------------------------------
- >Scott Ferguson Exxon Research & Engineering Co.
- >Project Engineer New Jersey
- >----------------------------------------------------------------------
- >"Always bark at a dog."
- >
- Cable channels 19, 20, and 21 are co-frequencies with narrow-band commercial
- land use two way radios and a few other commercial radio users. Any fault
- in a cable system that allows leakage or 'signal egress' also allows 'signal
- ingress' or the entry of interfering signals. If you live near a major
- airport, you might be able to intimidate your system into improving the
- interference problems by mentioning the possibility of leaks in the neighbor-
- hood. However if your TV set RF section is poorly sheilded, the ingress
- could be happening right at the back of your set...
- Good luck... Ted..
-